Try disabling any of the launchd tasks related to it, odds are theres a service that starts at boot/login regardless of any user-facing setting that do nothing if they're all turned off (just like iCloud related daemons).
Odds are you'll probably run into something that requires you to disable SIP, like I did when I got tired of mediaanalysisd eating up CPU cycles on a 2018 Mac mini.
Thanks, I believe this is what the debloat script mentioned in my post does. I manually executed the `launchctl bootout` and `launchctl disable` commands on all Siri and AI-related services in the https://github.com/OleksandrKrupko/mac-os-debloat/blob/main/... script, but the "Siri" process ("Siri AI.app") still keeps running even after restarting.
The Siri AI.app is read-only, so I could not even remove it. But perhaps it would be possible to boot into Recovery, mount the system partition as rw and delete the Siri AI.app from the filesystem?
P.S. I did also disable mediaanalysisd and photoanalysisd, and those are NOT running. However, the Siri AI.app does keep running...